Hi friends,thank you for all these replies!
I eventually bought the 28 3.5 28 2.8 because the seller already sold it, so now it isn't important to talk about the 2.8 versions.
Rather, I have to ask you one thing: I mounted this lens on my nikon fe and I noticed that looking into the viewer, the numbers of the diaphragms are not visible.This detail it isn't important to me,but I hope this detail doesn't mean this lens is not suitable for my Nikon FE?
Thank you very much!